[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[bugproxy]

** Tags removed: verification-done-xenial verification-done-zesty
** Tags added: bugnameltc-146489 severity-critical

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Mauricio Faria de Oliveira]

Verification done on Zesty.

$ lsb_release -d
Description:Ubuntu 17.04

$ wget 'https://launchpadlibrarian.net/337656213/file_146489.txt' -O 
io_setup_v2.c
$ sudo apt-get --yes install gcc libaio-dev
$ gcc -o io_setup_v2 io_setup_v2.c -laio

Previous kernel:
---

$ sudo apt-get --yes install linux-image-generic=4.10.0.37.37
$ sudo kexec --append="$(cat /proc/cmdline)" 
--initrd=/boot/initrd.img-4.10.0-37-generic /boot/vmlinux-4.10.0-37-generic 
...
$ uname -rv
4.10.0-37-generic #41-Ubuntu SMP Fri Oct 6 20:22:54 UTC 2017


$ ./io_setup_v2 1 65536
nr_events: 1, nr_requests: 65536
rc = -11, i = 204
^Z
[1]+  Stopped ./io_setup_v2 1 65536

$ cat /proc/sys/fs/aio-nr
130560
$ cat /proc/sys/fs/aio-max-nr
65536
$ kill %%


Current kernel:
--

$ sudo apt-get --yes install linux-image-generic=4.10.0.38.38
$ sudo kexec --append="$(cat /proc/cmdline)" 
--initrd=/boot/initrd.img-4.10.0-38-generic /boot/vmlinux-4.10.0-38-generic 
...
$ uname -rv
4.10.0-38-generic #42-Ubuntu SMP Tue Oct 10 13:22:54 UTC 2017
$ ./io_setup_v2 1 65536
nr_events: 1, nr_requests: 65536
rc = -12, i = 65514
^Z
[1]+  Stopped ./io_setup_v2 1 65536
$ cat /proc/sys/fs/aio-nr
65514
$ cat /proc/sys/fs/aio-max-nr
65536
$ kill %%

** Tags removed: verification-needed-zesty
** Tags added: verification-done-zesty

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Title:
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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Mauricio Faria de Oliveira]

Verification done on Xenial v4.4-based kernel.

$ lsb_release -d
Description:Ubuntu 16.04.3 LTS

$ wget 'https://launchpadlibrarian.net/337656213/file_146489.txt' -O 
io_setup_v2.c
$ sudo apt-get install gcc libaio-dev
$ gcc -o io_setup_v2 io_setup_v2.c -laio

Previous kernel:
---

$ sudo apt-get --yes install linux-image-generic=4.4.0.97.102   
   
$ sudo kexec --append="$(cat /proc/cmdline)" 
--initrd=/boot/initrd.img-4.4.0-97-generic /boot/vmlinux-4.4.0-97-generic 
...
$ uname -rv
4.4.0-97-generic #120-Ubuntu SMP Tue Sep 19 17:26:02 UTC 2017

$ ./io_setup_v2 1 65536
nr_events: 1, nr_requests: 65536
rc = -11, i = 409
^Z
[1]+  Stopped ./io_setup_v2 1 65536
$ cat /proc/sys/fs/aio-nr
130880
$ cat /proc/sys/fs/aio-max-nr
65536
$ kill %%

Current kernel:
--

$ sudo apt-get --yes install linux-image-generic=4.4.0.98.103  
$ sudo kexec --append="$(cat /proc/cmdline)" 
--initrd=/boot/initrd.img-4.4.0-98-generic /boot/vmlinux-4.4.0-98-generic 
...
$ uname -rv
4.4.0-98-generic #121-Ubuntu SMP Tue Oct 10 14:23:01 UTC 2017

$ ./io_setup_v2 1 65536
nr_events: 1, nr_requests: 65536
rc = -12, i = 65515
^Z
[1]+  Stopped ./io_setup_v2 1 65536

$ cat /proc/sys/fs/aio-nr
65515

$ cat /proc/sys/fs/aio-max-nr
65536


** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Frank Heimes]

** Changed in: ubuntu-power-systems
   Status: Fix Committed => Fix Released

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.4.0-98.121

---
linux (4.4.0-98.121) xenial; urgency=low

  * linux: 4.4.0-98.121 -proposed tracker (LP: #1722299)

  * Controller lockup detected on ProLiant DL380 Gen9 with P440 Controller
(LP: #1720359)
- scsi: hpsa: limit transfer length to 1MB

  * [Dell Docking IE][0bda:8153] Realtek USB Ethernet leads to system hang
(LP: #1720977)
- r8152: fix the list rx_done may be used without initialization

  * Add installer support for Broadcom BCM573xx network drivers. (LP: #1720466)
- d-i: Add bnxt_en to nic-modules.

  * snapcraft.yaml: add dpkg-dev to the build deps (LP: #1718886)
- snapcraft.yaml: add dpkg-dev to the build deps

  * Support setting I2C_TIMEOUT via ioctl for i2c-designware (LP: #1718578)
- i2c: designware: Use transfer timeout from ioctl I2C_TIMEOUT

  * 5U84 - ses driver isn't binding right - cannot blink lights on 1 of the 2
5u84 (LP: #1693369)
- scsi_transport_sas: add function to get SAS endpoint address
- ses: fix discovery of SATA devices in SAS enclosures
- scsi: sas: provide stub implementation for scsi_is_sas_rphy
- scsi: ses: Fix SAS device detection in enclosure

  * multipath -ll is not showing the disks which are actually multipath
(LP: #1718397)
- fs: aio: fix the increment of aio-nr and counting against aio-max-nr

  * Support Dell Wireless DW5819/5818 WWAN devices (LP: #1721455)
- SAUCE: USB: serial: qcserial: add Dell DW5818, DW5819

  * CVE-2017-10911
- xen-blkback: don't leak stack data via response ring

  * implement 'complain mode' in seccomp for developer mode with snaps
(LP: #1567597)
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Action to log before allowing

  * implement errno action logging in seccomp for strict mode with snaps
(LP: #1721676)
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Filter flag to log all actions except SECCOMP_RET_ALLOW

  * [Xenial] update OpenNSL kernel modules to 6.5.10 (LP: #1721511)
- SAUCE: update OpenNSL kernel modules to 6.5.10

  * Xenial update to 4.4.90 stable release (LP: #1721550)
- cifs: release auth_key.response for reconnect.
- mac80211: flush hw_roc_start work before cancelling the ROC
- KVM: PPC: Book3S: Fix race and leak in kvm_vm_ioctl_create_spapr_tce()
- tracing: Fix trace_pipe behavior for instance traces
- tracing: Erase irqsoff trace with empty write
- md/raid5: fix a race condition in stripe batch
- md/raid5: preserve STRIPE_ON_UNPLUG_LIST in break_stripe_batch_list
- scsi: scsi_transport_iscsi: fix the issue that iscsi_if_rx doesn't parse
  nlmsg properly
- crypto: talitos - Don't provide setkey for non hmac hashing algs.
- crypto: talitos - fix sha224
- KEYS: fix writing past end of user-supplied buffer in keyring_read()
- KEYS: prevent creating a different user's keyrings
- KEYS: prevent KEYCTL_READ on negative key
- powerpc/pseries: Fix parent_dn reference leak in add_dt_node()
- Fix SMB3.1.1 guest authentication to Samba
- SMB: Validate negotiate (to protect against downgrade) even if signing off
- SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags
- vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets
- nl80211: check for the required netlink attributes presence
- bsg-lib: don't free job in bsg_prepare_job
- seccomp: fix the usage of get/put_seccomp_filter() in seccomp_get_filter()
- arm64: Make sure SPsel is always set
- arm64: fault: Route pte translation faults via do_translation_fault
- KVM: VMX: Do not BUG() on out-of-bounds guest IRQ
- kvm: nVMX: Don't allow L2 to access the hardware CR8
- PCI: Fix race condition with driver_override
- btrfs: fix NULL pointer dereference from free_reloc_roots()
- btrfs: propagate error to btrfs_cmp_data_prepare caller
- btrfs: prevent to set invalid default subvolid
- x86/fpu: Don't let userspace set bogus xcomp_bv
- gfs2: Fix debugfs glocks dump
- timer/sysclt: Restrict timer migration sysctl values to 0 and 1
- KVM: VMX: do not change SN bit in vmx_update_pi_irte()
- KVM: VMX: remove WARN_ON_ONCE in kvm_vcpu_trigger_posted_interrupt
- cxl: Fix driver use count
- dmaengine: mmp-pdma: add number of requestors
- ARM: pxa: add the number of DMA requestor lines
- ARM: pxa: fix the number of DMA requestor lines
- KVM: VMX: use 

[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.10.0-38.42

---
linux (4.10.0-38.42) zesty; urgency=low

  * linux: 4.10.0-38.42 -proposed tracker (LP: #1722330)

  * Controller lockup detected on ProLiant DL380 Gen9 with P440 Controller
(LP: #1720359)
- scsi: hpsa: limit transfer length to 1MB

  * [Dell Docking IE][0bda:8153] Realtek USB Ethernet leads to system hang
(LP: #1720977)
- r8152: fix the list rx_done may be used without initialization

  * Touchpad not detected in Lenovo X1 Yoga / Yoga 720-15IKB (LP: #1700657)
- mfd: intel-lpss: Add missing PCI ID for Intel Sunrise Point LPSS devices

  * Add installer support for Broadcom BCM573xx network drivers. (LP: #1720466)
- d-i: Add bnxt_en to nic-modules.

  * CVE-2017-1000252
- KVM: VMX: Do not BUG() on out-of-bounds guest IRQ

  * CVE-2017-10663
- f2fs: sanity check checkpoint segno and blkoff

  * xfstest sanity checks on seek operations fails (LP: #1696049)
- xfs: fix off-by-one on max nr_pages in xfs_find_get_desired_pgoff()

  * [P9, Power NV][ WSP][Ubuntu 16.04.03] : perf hw breakpoint command results
in call traces and system goes for reboot. (LP: #1706033)
- powerpc/64s: Handle data breakpoints in Radix mode

  * 5U84 - ses driver isn't binding right - cannot blink lights on 1 of the 2
5u84 (LP: #1693369)
- scsi: ses: do not add a device to an enclosure if enclosure_add_links()
  fails.

  * Vlun resize request could fail with cxlflash driver (LP: #1713575)
- scsi: cxlflash: Fix vlun resize failure in the shrink path

  * More migrations with constant load (LP: #1713576)
- sched/fair: Prefer sibiling only if local group is under-utilized

  * New PMU fixes for marked events. (LP: #1716491)
- powerpc/perf: POWER9 PMU stops after idle workaround

  * CVE-2017-14340
- xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present

  * [Zesty][Yakkety] rtl8192e bug fixes (LP: #1698470)
- staging: rtl8192e: rtl92e_fill_tx_desc fix write to mapped out memory.
- staging: rtl8192e: fix 2 byte alignment of register BSSIDR.
- staging: rtl8192e: rtl92e_get_eeprom_size Fix read size of EPROM_CMD.
- staging: rtl8192e: GetTs Fix invalid TID 7 warning.

  * Stranded with ENODEV after mdadm --readonly (LP: #1706243)
- md: MD_CLOSING needs to be cleared after called md_set_readonly or
  do_md_stop

  * multipath -ll is not showing the disks which are actually multipath
(LP: #1718397)
- fs: aio: fix the increment of aio-nr and counting against aio-max-nr

  * ETPS/2 Elantech Touchpad inconsistently detected (Gigabyte P57W laptop)
(LP: #1594214)
- Input: i8042 - add Gigabyte P57 to the keyboard reset table

  * CVE-2017-10911
- xen-blkback: don't leak stack data via response ring

  * CVE-2017-11176
- mqueue: fix a use-after-free in sys_mq_notify()

  * implement 'complain mode' in seccomp for developer mode with snaps
(LP: #1567597)
- Revert "UBUNTU: SAUCE: seccomp: log actions even when audit is disabled"
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Action to log before allowing

  * implement errno action logging in seccomp for strict mode with snaps
(LP: #1721676)
- Revert "UBUNTU: SAUCE: seccomp: log actions even when audit is disabled"
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Filter flag to log all actions except SECCOMP_RET_ALLOW

  * Backport recent bbr bugfixes to 4.10 kernel (LP: #1708604)
- tcp_bbr: cut pacing rate only if filled pipe
- tcp_bbr: introduce bbr_bw_to_pacing_rate() helper
- tcp_bbr: introduce bbr_init_pacing_rate_from_rtt() helper
- tcp_bbr: remove sk_pacing_rate=0 transient during init
- tcp_bbr: init pacing rate on first RTT sample

  * [SRU][Zesty] Fix lscpu segfault on ARM64 with SMBIOS v2.0 (LP: #1716483)
- arm64: kernel: restrict /dev/mem read() calls to linear region

 -- Kleber Sacilotto de Souza   Tue, 10 Oct
2017 13:49:34 +0200

** Changed in: linux (Ubuntu Zesty)
   Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-1000252

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-10663

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-10911

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-11176

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-14340

-- 
You 

[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Kleber Sacilotto de Souza]

Hello IBM,

Could you please verify the fix with the xenial and/or zesty kernels
currently in -proposed?

Thank you!

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Kleber Sacilotto de Souza]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verification-needed-xenial' to 'verification-failed-
xenial'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-xenial

** Tags added: verification-needed-zesty

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Kleber Sacilotto de Souza]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
zesty' to 'verification-done-zesty'. If the problem still exists, change
the tag 'verification-needed-zesty' to 'verification-failed-zesty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Frank Heimes]

** Changed in: ubuntu-power-systems
   Status: In Progress => Fix Committed

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Thadeu Lima de Souza Cascardo]

** Changed in: linux (Ubuntu Xenial)
   Status: Triaged => Fix Committed

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Thadeu Lima de Souza Cascardo]

** Changed in: linux (Ubuntu Zesty)
   Status: Triaged => Fix Committed

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[bugproxy]

** Tags removed: bugnameltc-146489 kernel-da-key severity-critical
triage-a

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Manoj Iyer]

** Changed in: linux (Ubuntu Zesty)
 Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

** Tags added: triage-a

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Frank Heimes]

** Changed in: ubuntu-power-systems
   Status: Triaged => In Progress

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.13.0-12.13

---
linux (4.13.0-12.13) artful; urgency=low

  * linux: 4.13.0-12.13 -proposed tracker (LP: #1718980)

  * [Feature] SKX: Support crystall ridge / far / near memory indication in PEBS
(LP: #1591813)
- perf/x86: Move Nehalem PEBS code to flag
- perf/x86: Fix data source decoding for Skylake

  * Upgrade to 4.13.0-11.12 in artful amd64 VM breaks display on wayland
(LP: #1718679)
- [Config] CONFIG_DRM_VBOXVIDEO=n

  * ipmmu-vmsa driver breaks arm64 boots (LP: #1718734)
- [Config] Disable CONFIG_IPMMU_VMSA on arm64

  * Vlun resize request could fail with cxlflash driver (LP: #1713575)
- scsi: cxlflash: Fix vlun resize failure in the shrink path

  * multipath -ll is not showing the disks which are actually multipath
(LP: #1718397)
- fs: aio: fix the increment of aio-nr and counting against aio-max-nr

  * [Feature] Crystal Ridge - BTT - Rework error clearing (LP: #1704350)
- libnvdimm, btt: fix a missed NVDIMM_IO_ATOMIC case in the write path
- libnvdimm, btt: refactor map entry operations with macros
- libnvdimm, btt: ensure that flags were also unchanged during a map_read
- libnvdimm, btt: cache sector_size in arena_info
- libnvdimm: fix potential deadlock while clearing errors
- libnvdimm, btt: rework error clearing

  * [Feature] Crystal Ridge - have 4k DAX faults use a common zero page
(LP: #1704439)
- mm: add vm_insert_mixed_mkwrite()
- dax: relocate some dax functions
- dax: use common 4k zero page for dax mmap reads
- dax: remove DAX code from page_cache_tree_insert()
- dax: move all DAX radix tree defs to fs/dax.c

  * [bug] 17.10: CDP test fail on platform of Purley-2S/4S/Neoncity,BDW-
de/ep/ex, (LP: #1716843)
- SAUCE: (no-up) x86/intel_rdt: Fix cdp info directory files issue

  * [featue] GPIO support for Denverton (LP: #1591829)
- pinctrl: intel: Add Intel Denverton pin controller support

  * ETPS/2 Elantech Touchpad inconsistently detected (Gigabyte P57W laptop)
(LP: #1594214)
- Input: i8042 - add Gigabyte P57 to the keyboard reset table

  * autopkgtest profile fails to build on armhf (LP: #1717920)
- [Packaging] autopkgtest -- disable d-i when dropping flavours

  * Artful update to v4.13.3 stable release (LP: #1718412)
- Revert "net: use lib/percpu_counter API for fragmentation mem accounting"
- Revert "net: fix percpu memory leaks"
- gianfar: Fix Tx flow control deactivation
- vhost_net: correctly check tx avail during rx busy polling
- ip6_gre: update mtu properly in ip6gre_err
- udp: drop head states only when all skb references are gone
- ipv6: fix memory leak with multiple tables during netns destruction
- ipv6: fix typo in fib6_net_exit()
- sctp: fix missing wake ups in some situations
- tcp: fix a request socket leak
- ip_tunnel: fix setting ttl and tos value in collect_md mode
- f2fs: let fill_super handle roll-forward errors
- f2fs: check hot_data for roll-forward recovery
- x86/fsgsbase/64: Fully initialize FS and GS state in start_thread_common
- x86/fsgsbase/64: Report FSBASE and GSBASE correctly in core dumps
- x86/switch_to/64: Rewrite FS/GS switching yet again to fix AMD CPUs
- x86/mm, mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison
  pages
- ovl: fix false positive ESTALE on lookup
- fuse: allow server to run in different pid_ns
- idr: remove WARN_ON_ONCE() when trying to replace negative ID
- libnvdimm, btt: check memory allocation failure
- libnvdimm: fix integer overflow static analysis warning
- xfs: write unmount record for ro mounts
- xfs: toggle readonly state around xfs_log_mount_finish
- xfs: Add infrastructure needed for error propagation during buffer IO
  failure
- xfs: Properly retry failed inode items in case of error during buffer
  writeback
- xfs: fix recovery failure when log record header wraps log end
- xfs: always verify the log tail during recovery
- xfs: fix log recovery corruption error due to tail overwrite
- xfs: handle -EFSCORRUPTED during head/tail verification
- xfs: stop searching for free slots in an inode chunk when there are none
- xfs: evict all inodes involved with log redo item
- xfs: check for race with xfs_reclaim_inode() in xfs_ifree_cluster()
- xfs: open-code xfs_buf_item_dirty()
- xfs: remove unnecessary dirty bli format check for ordered bufs
- xfs: ordered buffer log items are never formatted
- xfs: refactor buffer logging into buffer dirtying helper
- xfs: don't log dirty ranges for ordered buffers
- xfs: skip bmbt block ino validation during owner change
- xfs: move bmbt owner change to last step of extent swap
- xfs: disallow marking previously dirty buffers as ordered
- xfs: relog dirty buffers during swapext bmbt owner change
- xfs: disable per-inode DAX 

[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Seth Forshee]

** Changed in: linux (Ubuntu Artful)
   Status: Triaged => Fix Committed

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Frank Heimes]

** Changed in: ubuntu-power-systems
   Status: New => Triaged

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Joseph Salisbury]

** Changed in: kernel-package (Ubuntu)
   Importance: Undecided => Critical

** Tags added: kernel-da-key

** Package changed: kernel-package (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Status: New => Triaged

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Artful)
   Importance: Critical
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
   Status: Triaged

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Zesty)
   Status: New => Triaged

** Changed in: linux (Ubuntu Xenial)
   Status: New => Triaged

** Changed in: linux (Ubuntu Zesty)
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Critical

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Mauricio Faria de Oliveira]

Patch posted to the kernel-team mailing list:

[A/Z/X][PATCH] fs: aio: fix the increment of aio-nr and counting against 
aio-max-nr
https://lists.ubuntu.com/archives/kernel-team/2017-September/087132.html

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Title:
  multipath -ll is not showing the disks which are actually multipath

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[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Mauricio Faria de Oliveira]

Added an SRU template to the bug description.

** Description changed:

+ [Impact]
+ 
+  * The number of available AIO contexts is severely limited
+on systems with a large number of possible CPUs 
+(e.g., IBM POWER8 processors w/ 20ish cores * 8 threads/core,
+and other multithreaded server-class processors).
+ 
+  * This prevents application such as multipath/directio checker
+to provide all of the available devices to the system.
+ 
+  * Other applications which depend on AIO can be affected/limited.
+ 
+  * The patch fixes how aio increments the number of active contexts
+(seen in /proc/sys/fs/aio-nr) and checks that against the global
+limit (seen in /proc/sys/fs/aio-max-nr).
+ 
+ [Test Case]
+ 
+  * A synthetic test-case is attached (io_setup_v2.c) and demonstrated
+(original/patched kernels) in comment #4.
+ 
+  * Trying to perform multipath discovery in debug/verbose mode
+(i.e., "multipath -v3" command) with sufficient number of 
+individual paths using the "directio" path checker should
+demonstrate the problem/solution as well (i.e., presence or
+not of "io_setup failed" messages).
+ 
+ [Regression Potential]
+ 
+  * Note the fix is trivial and has been tested by several users,
+even caused the introduction of a new test-case in "libaio";
+(but that can never be a strong enough reason for no more errors).
+ 
+  * Applications which use aio with small "nr_events" value as argument
+to "io_setup()" now have access to a much larger number of aio contexts;
+but hopefully those apps are already only requesting what they need,
+not trying to get more and more.
+ 
+  * Applications which relied in the _incorrect_ behavior of 
'/proc/sys/fs/aio-nr'
+being possibly greater than '/proc/sys/fs/aio-max-nr' might have problems,
+but those apps should be fixed.
+ 
+ 
  Problem Description
  =
  I am facing this issue for Texan Flash storage 840 disks which are coming 
from coho and salfish adapter
  
  coho adapter with 840 storage  is 3G disks and salfish adapter with 840
  is 12G disks
  
  I am able to see those disks in lsblk o/p but not in multipath -ll
  comamnd
  
  0004:01:00.0 Coho: Saturn-X  U78C9.001.WZS0060-P1-C6 
0x1090fa2a51f8  host10  Online
  0004:01:00.1 Coho: Saturn-X  U78C9.001.WZS0060-P1-C6 
0x1090fa2a51f9  host11  Online
  
  0005:09:00.0 Sailfish: QLogic 8GBU78C9.001.WZS0060-P1-C9 
0x2124ff787778  host2   Online
  0005:09:00.1 Sailfish: QLogic 8GBU78C9.001.WZS0060-P1-C9 
0x2124ff787779  host4   Online
  
  root@luckyv1:/dev/disk# multipath -ll | grep "size=3.0G" -B 1
  root@luckyv1:/dev/disk# multipath -ll | grep "size=12G" -B 1
  root@luckyv1:/dev/disk#
  
  == Comment: #3 - Luciano Chavez  - 2016-09-20 20:22:20 ==
  I edited /etc/multipath.conf and added
  verbosity 6
  
  to crank up the output and ran multipath -ll and saved it off to a text
  file (attached). All the using the directio checker failed and those
  using the tur checker seem to work.
  
  Sep 20 20:07:36 | loading //lib/multipath/libcheckdirectio.so checker
  Sep 20 20:07:36 | loading //lib/multipath/libprioconst.so prioritizer
  Sep 20 20:07:36 | Discover device 
/sys/devices/pci:00/:00:00.0/:01:00.0/host3/rport-3:0-2/target3:0:0/3:0:0:0/block/sdai
  Sep 20 20:07:36 | sdai: udev property ID_WWN whitelisted
  Sep 20 20:07:36 | sdai: not found in pathvec
  Sep 20 20:07:36 | sdai: mask = 0x25
  Sep 20 20:07:36 | sdai: dev_t = 66:32
  Sep 20 20:07:36 | open 
'/sys/devices/pci:00/:00:00.0/:01:00.0/host3/rport-3:0-2/target3:0:0/3:0:0:0/block/sdai/size'
  Sep 20 20:07:36 | sdai: size = 20971520
  Sep 20 20:07:36 | sdai: vendor = IBM
  Sep 20 20:07:36 | sdai: product = FlashSystem-9840
  Sep 20 20:07:36 | sdai: rev = 1442
  Sep 20 20:07:36 | sdai: h:b:t:l = 3:0:0:0
  Sep 20 20:07:36 | SCSI target 3:0:0 -> FC rport 3:0-2
  Sep 20 20:07:36 | sdai: tgt_node_name = 0x500507605e839800
  Sep 20 20:07:36 | open 
'/sys/devices/pci:00/:00:00.0/:01:00.0/host3/rport-3:0-2/target3:0:0/3:0:0:0/state'
  Sep 20 20:07:36 | sdai: path state = running
  Sep 20 20:07:36 | sdai: get_state
  Sep 20 20:07:36 | sdai: path_checker = directio (internal default)
  Sep 20 20:07:36 | sdai: checker timeout = 30 ms (internal default)
  Sep 20 20:07:36 | io_setup failed
  Sep 20 20:07:36 | sdai: checker init failed
  
  == Comment: #7 - Mauricio Faria De Oliveira  - 
2016-09-27 18:32:57 ==
  The function is failing at the io_setup() system call.
  
   @ checkers/directio.c
  
   int libcheck_init (struct checker * c)
   {
    unsigned long pgsize = getpagesize();
    struct directio_context * ct;
    long flags;
  
    ct = malloc(sizeof(struct directio_context));
    if (!ct)
    return 1;
    memset(ct, 0, sizeof(struct 

[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Mauricio Faria de Oliveira]

Verification of this commit with the linux-hwe-edge kernel in -proposed,
using the attached test-case "io_setup_v2.c"

commit 2a8a98673c13cb2a61a6476153acf8344adfa992
Author: Mauricio Faria de Oliveira 
Date: Wed Jul 5 10:53:16 2017 -0300

fs: aio: fix the increment of aio-nr and counting against aio-
max-nr

Test-case (attached)

$ sudo apt-get install gcc libaio-dev
$ gcc -o io_setup_v2 io_setup_v2.c -laio

Original kernel:

- Only 409 io_contexts could be allocated,
but that took 130880 [ div by 2, per bug] = 65440 slots out of 65535

$ uname -rv
4.11.0-14-generic #20~16.04.1-Ubuntu SMP Wed Aug 9 09:06:18 UTC 2017

$ ./io_setup_v2 1 65536
nr_events: 1, nr_requests: 65536
rc = -11, i = 409
^Z
[1]+ Stopped ./io_setup_v2 1 65536

$ cat /proc/sys/fs/aio-nr
130880

$ cat /proc/sys/fs/aio-max-nr
65536

$ kill %%

Patched kernel:

- Now 65515 io_contexts could be allocated out of 65535 (much better)
  (and reporting correctly, without div by 2.)

$ uname -rv
4.11.0-140-generic #20~16.04.1+bz146489 SMP Tue Sep 19 17:46:15 CDT 2017

$ ./io_setup_v2 1 65536
nr_events: 1, nr_requests: 65536
rc = -12, i = 65515
^Z
[1]+ Stopped ./io_setup_v2 1 65536

$ cat /proc/sys/fs/aio-nr
65515

$ kill %%

** Description changed:

  Problem Description
  =
  I am facing this issue for Texan Flash storage 840 disks which are coming 
from coho and salfish adapter
  
  coho adapter with 840 storage  is 3G disks and salfish adapter with 840
  is 12G disks
  
  I am able to see those disks in lsblk o/p but not in multipath -ll
  comamnd
  
  0004:01:00.0 Coho: Saturn-X  U78C9.001.WZS0060-P1-C6 
0x1090fa2a51f8  host10  Online
  0004:01:00.1 Coho: Saturn-X  U78C9.001.WZS0060-P1-C6 
0x1090fa2a51f9  host11  Online
  
  0005:09:00.0 Sailfish: QLogic 8GBU78C9.001.WZS0060-P1-C9 
0x2124ff787778  host2   Online
  0005:09:00.1 Sailfish: QLogic 8GBU78C9.001.WZS0060-P1-C9 
0x2124ff787779  host4   Online
- 
  
  root@luckyv1:/dev/disk# multipath -ll | grep "size=3.0G" -B 1
  root@luckyv1:/dev/disk# multipath -ll | grep "size=12G" -B 1
  root@luckyv1:/dev/disk#
  
  == Comment: #3 - Luciano Chavez  - 2016-09-20 20:22:20 ==
  I edited /etc/multipath.conf and added
  verbosity 6
  
  to crank up the output and ran multipath -ll and saved it off to a text
  file (attached). All the using the directio checker failed and those
  using the tur checker seem to work.
  
  Sep 20 20:07:36 | loading //lib/multipath/libcheckdirectio.so checker
  Sep 20 20:07:36 | loading //lib/multipath/libprioconst.so prioritizer
  Sep 20 20:07:36 | Discover device 
/sys/devices/pci:00/:00:00.0/:01:00.0/host3/rport-3:0-2/target3:0:0/3:0:0:0/block/sdai
  Sep 20 20:07:36 | sdai: udev property ID_WWN whitelisted
  Sep 20 20:07:36 | sdai: not found in pathvec
  Sep 20 20:07:36 | sdai: mask = 0x25
  Sep 20 20:07:36 | sdai: dev_t = 66:32
  Sep 20 20:07:36 | open 
'/sys/devices/pci:00/:00:00.0/:01:00.0/host3/rport-3:0-2/target3:0:0/3:0:0:0/block/sdai/size'
  Sep 20 20:07:36 | sdai: size = 20971520
  Sep 20 20:07:36 | sdai: vendor = IBM
  Sep 20 20:07:36 | sdai: product = FlashSystem-9840
  Sep 20 20:07:36 | sdai: rev = 1442
  Sep 20 20:07:36 | sdai: h:b:t:l = 3:0:0:0
  Sep 20 20:07:36 | SCSI target 3:0:0 -> FC rport 3:0-2
  Sep 20 20:07:36 | sdai: tgt_node_name = 0x500507605e839800
  Sep 20 20:07:36 | open 
'/sys/devices/pci:00/:00:00.0/:01:00.0/host3/rport-3:0-2/target3:0:0/3:0:0:0/state'
  Sep 20 20:07:36 | sdai: path state = running
  Sep 20 20:07:36 | sdai: get_state
  Sep 20 20:07:36 | sdai: path_checker = directio (internal default)
  Sep 20 20:07:36 | sdai: checker timeout = 30 ms (internal default)
  Sep 20 20:07:36 | io_setup failed
  Sep 20 20:07:36 | sdai: checker init failed
  
- == Comment: #4 - Luciano Chavez  - 2016-09-20 21:00:23 ==
- Hello Mauricio,
- 
- I edited /etc/multipath.conf to use the tur path checker but the output
- still shows directio. Ideas?
- 
- devices {
- device {
- vendor  "IBM "
- product "FlashSystem-9840"
- path_selector   "round-robin 0"
- path_grouping_policymultibus
- path_checkertur
- rr_weight   uniform
- no_path_retry   fail
- failbackimmediate
- dev_loss_tmo300
- fast_io_fail_tmo25
- }
- }
- 
  == Comment: #7 - Mauricio Faria De Oliveira  - 
2016-09-27 18:32:57 ==
  The function is failing at the io_setup() system 

[Bug 1718397] Re: multipath -ll is not showing the disks which are actually multipath

[Andrew Cloke]

** Also affects: ubuntu-power-systems
   Importance: Undecided
   Status: New

** Changed in: ubuntu-power-systems
 Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

** Changed in: ubuntu-power-systems
   Importance: Undecided => Critical

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  multipath -ll is not showing the disks which are actually multipath

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